Best of the Newsgroups: P4 on OSR5.05

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From: Bela Lubkin <belal@sco.com>
Subject: Re: P4 Xeon compatibility with 5.0.5
Date: Tue, 24 Feb 2004 10:11:37 GMT
Message-ID: <20040224101137.GM24746@sco.com> 
References: <u1w_b.110557$B81.650192@twister.tampabay.rr.com> <pan.2004.02.24.04.25.56.193000@rothert.com> <403ada39$1@dnews.tpgi.com.au> 

Stuart J. Browne wrote:

> I remember a thread a while back with people using 507 on P4 series, and
> were having issues with clock throttling.  THis was fixed with MP1.
> 
> 505 & 506 has no abilities whats-so-ever with regards to this, or other
> functions of the P4 series chips.

Your timeline is a little off: P4 thermal support was added in rs506a.
OSR506 without rs506a, and earlier releases, are in danger of
overheating a CPU, causing it to slow down drastically or in extreme
cases, damage the CPU.

> From a post Bela did, I beleive 505 will work, but not to the best of the
> CPU's capabilities, and not able to use the built-in protections the CPU
> has.

That was my belief back then.  I've recently heard of cases where actual
damage may have occurred.  Apparently the P4's self-protective circuitry
doesn't react very quickly, so if something is spinning very hard and
the machine's thermal design is poor, the CPU or motherboard can
actually be damaged.

> If you insist on staying on OSR505, then I'd suggest a pre-P4 series of
> processor.

I agree.

If you absolutely must use OSR505 on a P4, you might want to run the CPU
at a lower clock speed than it's rated for.  This gives it a much wider
margin for reacting to sudden heat surges.

>Bela<

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